package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.conditions.update.UpdateChainWrapper;
import com.baomidou.mybatisplus.extension.kotlin.KtQueryChainWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.mapper.DishMapper;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.CategoryService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpI extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;


    @Override
    public void deleteCategory(Long id) {
        //根据分类ID 查询该分类下是否有菜品 如果有 就不再向下执行
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        dishLambdaQueryWrapper.eq(Dish::getCategoryId,id);

        //计数
        Integer dishCount = dishMapper.selectCount(dishLambdaQueryWrapper);
        //如果大于0则表示有 不能向下执行
        if ( dishCount > 0 ){
            throw  new CustomException("该分类下有关联的菜品信息,不能直接删除");
        }

        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId,id);

        Integer setmealCount = setmealMapper.selectCount(setmealLambdaQueryWrapper);

        if ( setmealCount > 0 ){
            throw new CustomException("该分类下有关联的套餐,不能直接删除");
        }

        //进行至此 可以删除
        this.removeById(id);

    }
}
